VideoBackends: Add AbstractStagingTexture class

Can be used for asynchronous readback or upload of textures.

1 files changed, 133 insertions, 1 deletions

diff --git a/Source/Core/VideoBackends/D3D/DXTexture.cpp b/Source/Core/VideoBackends/D3D/DXTexture.cpp
index 30f664b5b4..92d3d112e9 100644
--- a/Source/Core/VideoBackends/D3D/DXTexture.cpp
+++ b/Source/Core/VideoBackends/D3D/DXTexture.cpp
@@ -217,8 +217,140 @@ void DXTexture::CopyRectangleFromTexture(const AbstractTexture* source,
 void DXTexture::Load(u32 level, u32 width, u32 height, u32 row_length, const u8* buffer,
                      size_t buffer_size)
 {
-  size_t src_pitch = CalculateHostTextureLevelPitch(m_config.format, row_length);
+  size_t src_pitch = CalculateStrideForFormat(m_config.format, row_length);
   D3D::context->UpdateSubresource(m_texture->GetTex(), level, nullptr, buffer,
                                   static_cast<UINT>(src_pitch), 0);
 }
+
+DXStagingTexture::DXStagingTexture(StagingTextureType type, const TextureConfig& config,
+                                   ID3D11Texture2D* tex)
+    : AbstractStagingTexture(type, config), m_tex(tex)
+{
+}
+
+DXStagingTexture::~DXStagingTexture()
+{
+  if (IsMapped())
+    DXStagingTexture::Unmap();
+  SAFE_RELEASE(m_tex);
+}
+
+std::unique_ptr<DXStagingTexture> DXStagingTexture::Create(StagingTextureType type,
+                                                           const TextureConfig& config)
+{
+  D3D11_USAGE usage;
+  UINT cpu_flags;
+  if (type == StagingTextureType::Readback)
+  {
+    usage = D3D11_USAGE_STAGING;
+    cpu_flags = D3D11_CPU_ACCESS_READ;
+  }
+  else if (type == StagingTextureType::Upload)
+  {
+    usage = D3D11_USAGE_DYNAMIC;
+    cpu_flags = D3D11_CPU_ACCESS_WRITE;
+  }
+  else
+  {
+    usage = D3D11_USAGE_STAGING;
+    cpu_flags = D3D11_CPU_ACCESS_READ | D3D11_CPU_ACCESS_WRITE;
+  }
+
+  CD3D11_TEXTURE2D_DESC desc(GetDXGIFormatForHostFormat(config.format), config.width, config.height,
+                             1, 1, 0, usage, cpu_flags);
+
+  ID3D11Texture2D* texture;
+  HRESULT hr = D3D::device->CreateTexture2D(&desc, nullptr, &texture);
+  CHECK(SUCCEEDED(hr), "Create staging texture");
+  if (FAILED(hr))
+    return nullptr;
+
+  return std::unique_ptr<DXStagingTexture>(new DXStagingTexture(type, config, texture));
+}
+
+void DXStagingTexture::CopyFromTexture(const AbstractTexture* src,
+                                       const MathUtil::Rectangle<int>& src_rect, u32 src_layer,
+                                       u32 src_level, const MathUtil::Rectangle<int>& dst_rect)
+{
+  _assert_(m_type == StagingTextureType::Readback);
+  _assert_(src_rect.GetWidth() == dst_rect.GetWidth() &&
+           src_rect.GetHeight() == dst_rect.GetHeight());
+  _assert_(src_rect.left >= 0 && static_cast<u32>(src_rect.right) <= src->GetConfig().width &&
+           src_rect.top >= 0 && static_cast<u32>(src_rect.bottom) <= src->GetConfig().height);
+  _assert_(dst_rect.left >= 0 && static_cast<u32>(dst_rect.right) <= m_config.width &&
+           dst_rect.top >= 0 && static_cast<u32>(dst_rect.bottom) <= m_config.height);
+
+  if (IsMapped())
+    DXStagingTexture::Unmap();
+
+  CD3D11_BOX src_box(src_rect.left, src_rect.top, 0, src_rect.right, src_rect.bottom, 1);
+  D3D::context->CopySubresourceRegion(
+      m_tex, 0, static_cast<u32>(dst_rect.left), static_cast<u32>(dst_rect.top), 0,
+      static_cast<const DXTexture*>(src)->GetRawTexIdentifier()->GetTex(),
+      D3D11CalcSubresource(src_level, src_layer, src->GetConfig().levels), &src_box);
+
+  m_needs_flush = true;
+}
+
+void DXStagingTexture::CopyToTexture(const MathUtil::Rectangle<int>& src_rect, AbstractTexture* dst,
+                                     const MathUtil::Rectangle<int>& dst_rect, u32 dst_layer,
+                                     u32 dst_level)
+{
+  _assert_(m_type == StagingTextureType::Upload);
+  _assert_(src_rect.GetWidth() == dst_rect.GetWidth() &&
+           src_rect.GetHeight() == dst_rect.GetHeight());
+  _assert_(src_rect.left >= 0 && static_cast<u32>(src_rect.right) <= m_config.width &&
+           src_rect.top >= 0 && static_cast<u32>(src_rect.bottom) <= m_config.height);
+  _assert_(dst_rect.left >= 0 && static_cast<u32>(dst_rect.right) <= dst->GetConfig().width &&
+           dst_rect.top >= 0 && static_cast<u32>(dst_rect.bottom) <= dst->GetConfig().height);
+
+  if (IsMapped())
+    DXStagingTexture::Unmap();
+
+  CD3D11_BOX src_box(src_rect.left, src_rect.top, 0, src_rect.right, src_rect.bottom, 1);
+  D3D::context->CopySubresourceRegion(
+      static_cast<const DXTexture*>(dst)->GetRawTexIdentifier()->GetTex(),
+      D3D11CalcSubresource(dst_level, dst_layer, dst->GetConfig().levels),
+      static_cast<u32>(dst_rect.left), static_cast<u32>(dst_rect.top), 0, m_tex, 0, &src_box);
+}
+
+bool DXStagingTexture::Map()
+{
+  if (m_map_pointer)
+    return true;
+
+  D3D11_MAP map_type;
+  if (m_type == StagingTextureType::Readback)
+    map_type = D3D11_MAP_READ;
+  else if (m_type == StagingTextureType::Upload)
+    map_type = D3D11_MAP_WRITE;
+  else
+    map_type = D3D11_MAP_READ_WRITE;
+
+  D3D11_MAPPED_SUBRESOURCE sr;
+  HRESULT hr = D3D::context->Map(m_tex, 0, map_type, 0, &sr);
+  CHECK(SUCCEEDED(hr), "Map readback texture");
+  if (FAILED(hr))
+    return false;
+
+  m_map_pointer = reinterpret_cast<char*>(sr.pData);
+  m_map_stride = sr.RowPitch;
+  return true;
+}
+
+void DXStagingTexture::Unmap()
+{
+  if (!m_map_pointer)
+    return;
+
+  D3D::context->Unmap(m_tex, 0);
+  m_map_pointer = nullptr;
+}
+
+void DXStagingTexture::Flush()
+{
+  // Flushing is handled by the API.
+  m_needs_flush = false;
+}
+
 }  // namespace DX11